Home / 13,125.64-18,112.90-7,157.20

Finding the Fourth Proportional to 13,125.64, 18,112.90 and 7,157.20

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Solution

The fourth proportional to 13,125.64, 18,112.90 and 7,157.20 is: 9,876.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,125.64 : 18,112.90 = 7,157.20 : x
  2. Step 2: Convert to fraction form
    13,125.64/18,112.90 = 7,157.20/x
  3. Step 3: Cross multiply
    13,125.64x = 18,112.90 × 7,157.20
  4. Step 4: Simplify right side
    13,125.64x = 129,637,647.88
  5. Step 5: Solve for x
    x = 129,637,647.88/13,125.64
  6. Step 6: Final answer
    x = 9,876.67

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.